Em sex 14 mar 2014, às 08:47:15, Jason H escreveu: > The frame is not laid out like RGB. This is for legacy reasons. Black and > White TV presented a black and white frame (Y) when color TV was added, it > was added in a backwards-compatible way
This has nothing to do with black & white TV. Digital image formats were invented way after colour TV. The reason why Y is sampled per pixel whereas U and V aren't is because the eye isn't as sensitive to colour as it is to luminosity. By using one U and one V for 4 pixels, we reduce the amount of data from 12 values to 6 in each 2x2 block -- that is, half the amount of data. There are some other YUV formats that lay out data differently, including all the chrominance values, like YUV 4:4:4. -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel Open Source Technology Center _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
